Ayame Satsuki is a blonde-haired, red-eyed teenage student at Roman Curia Surei Academy, belonging to its sorority, with physical measurements of bust 79, waist 52, and hip 78. Her name "Ayame" means "iris" and her surname "Satsuki" translates to "May".

She displays an obsessive devotion to fellow student Miyuki Seta, consistently calling her "onee-sama." This fixation compels Ayame to seek revenge after Miyuki's defeat by Alexander Nikolaevich Hell. She repeatedly tries to ambush or ensnare Alexander but fails each time, resulting in her own defeat and Alexander extracting her soma.

Her character strongly parallels Hana Katsuragi in yuri tendencies and a preoccupation with lolicon themes. After Ekaterina Kurae arrives at the academy, Ayame becomes subservient to her, joining Hana as one of Ekaterina's slaves. This dynamic involves BDSM-oriented control, such as Ekaterina licking Ayame's cheek and provoking a nervously shy reaction. Ayame eventually serves as Ekaterina's Maria, formalizing their master-servant relationship.

While maintaining her loyalty to Miyuki, Ayame develops an additional attachment to Ekaterina. Her affiliations and interactions remain centered within the academy environment, with no elemental abilities or Qwaser powers indicated.